2. Use an electric beater to beat butter, sugar and vanilla in a medium bowl for 5 minutes or until pale and creamy.

3. Add the eggs, 1 at a time, beating well after each addition. Transfer mixture to a large bowl. Add banana. Use a large metal spoon to fold in half the flour and half the bicarbonate of soda. Fold in half the milk. Repeat with remaining flour, bicarbonate of soda and milk. Stir until just smooth.

4. Spoon the mixture into the prepared pan and smooth the surface. Bake for 30 minutes or until a skewer inserted in the centre comes out clean. Set aside in the pan for 10 minutes to cool. Turn onto a wire rack over a baking tray and set aside to cool.